for same day 1:30 pm flight - without a car and without having to leave Dingle the night before ... Thanx.
Even driving a car I think you'd have to leave Dingle the night before to comfortably make a 1:30 flight. It's about a 3.5 hour drive by car, and would be longer by bus (whose schedule you can't control), which stops along the way. And you have to allow plenty of time for checking in, going through security, etc. I've been to Ireland several times and would never stay that far away from the airport the night before my flight out.
After checking the Bus Eireann site, I agree with Nancy. The earliest bus leaves Dingle at 07:15. After changing in Tralee and Limerick, you would arrive at Shannon at 11:55. That's cutting it too close for a flight home (if that's where you'll be going). For the record, there is no morning bus on Sundays.
I suggest that you take the afternoon bus to Ennis and spend the night there.